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Finding the Fourth Proportional to 690.32, 1,032.12 and 472.40

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Solution

The fourth proportional to 690.32, 1,032.12 and 472.40 is: 706.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.32 : 1,032.12 = 472.40 : x
  2. Step 2: Convert to fraction form
    690.32/1,032.12 = 472.40/x
  3. Step 3: Cross multiply
    690.32x = 1,032.12 × 472.40
  4. Step 4: Simplify right side
    690.32x = 487,573.49
  5. Step 5: Solve for x
    x = 487,573.49/690.32
  6. Step 6: Final answer
    x = 706.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.