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Finding the Fourth Proportional to 740.84, 1,022.06 and 478.76

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Solution

The fourth proportional to 740.84, 1,022.06 and 478.76 is: 660.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.84 : 1,022.06 = 478.76 : x
  2. Step 2: Convert to fraction form
    740.84/1,022.06 = 478.76/x
  3. Step 3: Cross multiply
    740.84x = 1,022.06 × 478.76
  4. Step 4: Simplify right side
    740.84x = 489,321.45
  5. Step 5: Solve for x
    x = 489,321.45/740.84
  6. Step 6: Final answer
    x = 660.50

Related Problems

Find fourth proportional to 370.42, 511.03 and 239.38
Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.