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Finding the Fourth Proportional to 130,685.59, 180,318.62 and 85,429.88

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Solution

The fourth proportional to 130,685.59, 180,318.62 and 85,429.88 is: 117,875.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    130,685.59 : 180,318.62 = 85,429.88 : x
  2. Step 2: Convert to fraction form
    130,685.59/180,318.62 = 85,429.88/x
  3. Step 3: Cross multiply
    130,685.59x = 180,318.62 × 85,429.88
  4. Step 4: Simplify right side
    130,685.59x = 15,404,598,068.37
  5. Step 5: Solve for x
    x = 15,404,598,068.37/130,685.59
  6. Step 6: Final answer
    x = 117,875.26

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1.5x scale

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.