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Finding the Fourth Proportional to 128,159.55, 176,830.20 and 74,412.18

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Solution

The fourth proportional to 128,159.55, 176,830.20 and 74,412.18 is: 102,671.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,159.55 : 176,830.20 = 74,412.18 : x
  2. Step 2: Convert to fraction form
    128,159.55/176,830.20 = 74,412.18/x
  3. Step 3: Cross multiply
    128,159.55x = 176,830.20 × 74,412.18
  4. Step 4: Simplify right side
    128,159.55x = 13,158,320,671.84
  5. Step 5: Solve for x
    x = 13,158,320,671.84/128,159.55
  6. Step 6: Final answer
    x = 102,671.40

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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.