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Finding the Fourth Proportional to 870.84, 1,201.65 and 497.79

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Solution

The fourth proportional to 870.84, 1,201.65 and 497.79 is: 686.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.84 : 1,201.65 = 497.79 : x
  2. Step 2: Convert to fraction form
    870.84/1,201.65 = 497.79/x
  3. Step 3: Cross multiply
    870.84x = 1,201.65 × 497.79
  4. Step 4: Simplify right side
    870.84x = 598,169.35
  5. Step 5: Solve for x
    x = 598,169.35/870.84
  6. Step 6: Final answer
    x = 686.89

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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.