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Finding the Fourth Proportional to 118,407.29, 178,307.80 and 85,359.89

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Solution

The fourth proportional to 118,407.29, 178,307.80 and 85,359.89 is: 128,542.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,407.29 : 178,307.80 = 85,359.89 : x
  2. Step 2: Convert to fraction form
    118,407.29/178,307.80 = 85,359.89/x
  3. Step 3: Cross multiply
    118,407.29x = 178,307.80 × 85,359.89
  4. Step 4: Simplify right side
    118,407.29x = 15,220,334,426.51
  5. Step 5: Solve for x
    x = 15,220,334,426.51/118,407.29
  6. Step 6: Final answer
    x = 128,542.21

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.