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Finding the Fourth Proportional to 877.34, 1,210.68 and 499.17

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Solution

The fourth proportional to 877.34, 1,210.68 and 499.17 is: 688.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.34 : 1,210.68 = 499.17 : x
  2. Step 2: Convert to fraction form
    877.34/1,210.68 = 499.17/x
  3. Step 3: Cross multiply
    877.34x = 1,210.68 × 499.17
  4. Step 4: Simplify right side
    877.34x = 604,337.80
  5. Step 5: Solve for x
    x = 604,337.80/877.34
  6. Step 6: Final answer
    x = 688.83

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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.