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Finding the Fourth Proportional to 870.86, 1,201.86 and 521.66

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Solution

The fourth proportional to 870.86, 1,201.86 and 521.66 is: 719.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.86 : 1,201.86 = 521.66 : x
  2. Step 2: Convert to fraction form
    870.86/1,201.86 = 521.66/x
  3. Step 3: Cross multiply
    870.86x = 1,201.86 × 521.66
  4. Step 4: Simplify right side
    870.86x = 626,962.29
  5. Step 5: Solve for x
    x = 626,962.29/870.86
  6. Step 6: Final answer
    x = 719.93

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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.