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Finding the Fourth Proportional to 917.79, 1,266.57 and 498.15

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Solution

The fourth proportional to 917.79, 1,266.57 and 498.15 is: 687.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.79 : 1,266.57 = 498.15 : x
  2. Step 2: Convert to fraction form
    917.79/1,266.57 = 498.15/x
  3. Step 3: Cross multiply
    917.79x = 1,266.57 × 498.15
  4. Step 4: Simplify right side
    917.79x = 630,939.74
  5. Step 5: Solve for x
    x = 630,939.74/917.79
  6. Step 6: Final answer
    x = 687.45

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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.