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Finding the Fourth Proportional to 740.76, 1,021.59 and 478.50

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Solution

The fourth proportional to 740.76, 1,021.59 and 478.50 is: 659.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.76 : 1,021.59 = 478.50 : x
  2. Step 2: Convert to fraction form
    740.76/1,021.59 = 478.50/x
  3. Step 3: Cross multiply
    740.76x = 1,021.59 × 478.50
  4. Step 4: Simplify right side
    740.76x = 488,830.82
  5. Step 5: Solve for x
    x = 488,830.82/740.76
  6. Step 6: Final answer
    x = 659.90

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Double scale
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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.