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Finding the Fourth Proportional to 128,497.18, 177,308.68 and 74,740.72

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Solution

The fourth proportional to 128,497.18, 177,308.68 and 74,740.72 is: 103,132.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,497.18 : 177,308.68 = 74,740.72 : x
  2. Step 2: Convert to fraction form
    128,497.18/177,308.68 = 74,740.72/x
  3. Step 3: Cross multiply
    128,497.18x = 177,308.68 × 74,740.72
  4. Step 4: Simplify right side
    128,497.18x = 13,252,178,031.75
  5. Step 5: Solve for x
    x = 13,252,178,031.75/128,497.18
  6. Step 6: Final answer
    x = 103,132.05

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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.