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Finding the Fourth Proportional to 154,689.48, 213,480.06 and 86,728.32

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Solution

The fourth proportional to 154,689.48, 213,480.06 and 86,728.32 is: 119,689.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,689.48 : 213,480.06 = 86,728.32 : x
  2. Step 2: Convert to fraction form
    154,689.48/213,480.06 = 86,728.32/x
  3. Step 3: Cross multiply
    154,689.48x = 213,480.06 × 86,728.32
  4. Step 4: Simplify right side
    154,689.48x = 18,514,766,957.30
  5. Step 5: Solve for x
    x = 18,514,766,957.30/154,689.48
  6. Step 6: Final answer
    x = 119,689.89

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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.