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Finding the Fourth Proportional to 128,042.40, 176,707.44 and 71,454.72

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Solution

The fourth proportional to 128,042.40, 176,707.44 and 71,454.72 is: 98,612.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,042.40 : 176,707.44 = 71,454.72 : x
  2. Step 2: Convert to fraction form
    128,042.40/176,707.44 = 71,454.72/x
  3. Step 3: Cross multiply
    128,042.40x = 176,707.44 × 71,454.72
  4. Step 4: Simplify right side
    128,042.40x = 12,626,580,647.12
  5. Step 5: Solve for x
    x = 12,626,580,647.12/128,042.40
  6. Step 6: Final answer
    x = 98,612.50

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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.