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Finding the Fourth Proportional to 690.24, 952.80 and 457.28

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Solution

The fourth proportional to 690.24, 952.80 and 457.28 is: 631.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.24 : 952.80 = 457.28 : x
  2. Step 2: Convert to fraction form
    690.24/952.80 = 457.28/x
  3. Step 3: Cross multiply
    690.24x = 952.80 × 457.28
  4. Step 4: Simplify right side
    690.24x = 435,696.38
  5. Step 5: Solve for x
    x = 435,696.38/690.24
  6. Step 6: Final answer
    x = 631.22

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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.