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Finding the Fourth Proportional to 85,646.32, 128,279.36 and 65,778.64

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Solution

The fourth proportional to 85,646.32, 128,279.36 and 65,778.64 is: 98,521.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,646.32 : 128,279.36 = 65,778.64 : x
  2. Step 2: Convert to fraction form
    85,646.32/128,279.36 = 65,778.64/x
  3. Step 3: Cross multiply
    85,646.32x = 128,279.36 × 65,778.64
  4. Step 4: Simplify right side
    85,646.32x = 8,438,041,840.87
  5. Step 5: Solve for x
    x = 8,438,041,840.87/85,646.32
  6. Step 6: Final answer
    x = 98,521.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.