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Finding the Fourth Proportional to 128,178.90, 176,886.72 and 71,590.28

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Solution

The fourth proportional to 128,178.90, 176,886.72 and 71,590.28 is: 98,794.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,178.90 : 176,886.72 = 71,590.28 : x
  2. Step 2: Convert to fraction form
    128,178.90/176,886.72 = 71,590.28/x
  3. Step 3: Cross multiply
    128,178.90x = 176,886.72 × 71,590.28
  4. Step 4: Simplify right side
    128,178.90x = 12,663,368,928.65
  5. Step 5: Solve for x
    x = 12,663,368,928.65/128,178.90
  6. Step 6: Final answer
    x = 98,794.49

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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.