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Finding the Fourth Proportional to 1,124.34, 1,686.98 and 539.65

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Solution

The fourth proportional to 1,124.34, 1,686.98 and 539.65 is: 809.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.34 : 1,686.98 = 539.65 : x
  2. Step 2: Convert to fraction form
    1,124.34/1,686.98 = 539.65/x
  3. Step 3: Cross multiply
    1,124.34x = 1,686.98 × 539.65
  4. Step 4: Simplify right side
    1,124.34x = 910,378.76
  5. Step 5: Solve for x
    x = 910,378.76/1,124.34
  6. Step 6: Final answer
    x = 809.70

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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.