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Finding the Fourth Proportional to 917.40, 1,266.01 and 497.76

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Solution

The fourth proportional to 917.40, 1,266.01 and 497.76 is: 686.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.40 : 1,266.01 = 497.76 : x
  2. Step 2: Convert to fraction form
    917.40/1,266.01 = 497.76/x
  3. Step 3: Cross multiply
    917.40x = 1,266.01 × 497.76
  4. Step 4: Simplify right side
    917.40x = 630,169.14
  5. Step 5: Solve for x
    x = 630,169.14/917.40
  6. Step 6: Final answer
    x = 686.91

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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.