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Finding the Fourth Proportional to 15,663.60, 21,615.72 and 8,590.08

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Solution

The fourth proportional to 15,663.60, 21,615.72 and 8,590.08 is: 11,854.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,663.60 : 21,615.72 = 8,590.08 : x
  2. Step 2: Convert to fraction form
    15,663.60/21,615.72 = 8,590.08/x
  3. Step 3: Cross multiply
    15,663.60x = 21,615.72 × 8,590.08
  4. Step 4: Simplify right side
    15,663.60x = 185,680,764.06
  5. Step 5: Solve for x
    x = 185,680,764.06/15,663.60
  6. Step 6: Final answer
    x = 11,854.28

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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.