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Finding the Fourth Proportional to 740.13, 1,021.65 and 478.23

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Solution

The fourth proportional to 740.13, 1,021.65 and 478.23 is: 660.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.13 : 1,021.65 = 478.23 : x
  2. Step 2: Convert to fraction form
    740.13/1,021.65 = 478.23/x
  3. Step 3: Cross multiply
    740.13x = 1,021.65 × 478.23
  4. Step 4: Simplify right side
    740.13x = 488,583.68
  5. Step 5: Solve for x
    x = 488,583.68/740.13
  6. Step 6: Final answer
    x = 660.13

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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.