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Finding the Fourth Proportional to 810.49, 1,117.65 and 530.74

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Solution

The fourth proportional to 810.49, 1,117.65 and 530.74 is: 731.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.49 : 1,117.65 = 530.74 : x
  2. Step 2: Convert to fraction form
    810.49/1,117.65 = 530.74/x
  3. Step 3: Cross multiply
    810.49x = 1,117.65 × 530.74
  4. Step 4: Simplify right side
    810.49x = 593,180.76
  5. Step 5: Solve for x
    x = 593,180.76/810.49
  6. Step 6: Final answer
    x = 731.88

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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.