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Finding the Fourth Proportional to 157,689.81, 217,612.71 and 86,071.50

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Solution

The fourth proportional to 157,689.81, 217,612.71 and 86,071.50 is: 118,779.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,689.81 : 217,612.71 = 86,071.50 : x
  2. Step 2: Convert to fraction form
    157,689.81/217,612.71 = 86,071.50/x
  3. Step 3: Cross multiply
    157,689.81x = 217,612.71 × 86,071.50
  4. Step 4: Simplify right side
    157,689.81x = 18,730,252,368.77
  5. Step 5: Solve for x
    x = 18,730,252,368.77/157,689.81
  6. Step 6: Final answer
    x = 118,779.09

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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.