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Finding the Fourth Proportional to 509.15, 702.61 and 288.10

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Solution

The fourth proportional to 509.15, 702.61 and 288.10 is: 397.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.15 : 702.61 = 288.10 : x
  2. Step 2: Convert to fraction form
    509.15/702.61 = 288.10/x
  3. Step 3: Cross multiply
    509.15x = 702.61 × 288.10
  4. Step 4: Simplify right side
    509.15x = 202,419.46
  5. Step 5: Solve for x
    x = 202,419.46/509.15
  6. Step 6: Final answer
    x = 397.56

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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.