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Finding the Fourth Proportional to 85,607.52, 128,462.06 and 38,859.72

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Solution

The fourth proportional to 85,607.52, 128,462.06 and 38,859.72 is: 58,312.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,607.52 : 128,462.06 = 38,859.72 : x
  2. Step 2: Convert to fraction form
    85,607.52/128,462.06 = 38,859.72/x
  3. Step 3: Cross multiply
    85,607.52x = 128,462.06 × 38,859.72
  4. Step 4: Simplify right side
    85,607.52x = 4,991,999,682.22
  5. Step 5: Solve for x
    x = 4,991,999,682.22/85,607.52
  6. Step 6: Final answer
    x = 58,312.63

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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.