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Finding the Fourth Proportional to 85,794.78, 128,549.90 and 60,710.50

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Solution

The fourth proportional to 85,794.78, 128,549.90 and 60,710.50 is: 90,965.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,794.78 : 128,549.90 = 60,710.50 : x
  2. Step 2: Convert to fraction form
    85,794.78/128,549.90 = 60,710.50/x
  3. Step 3: Cross multiply
    85,794.78x = 128,549.90 × 60,710.50
  4. Step 4: Simplify right side
    85,794.78x = 7,804,328,703.95
  5. Step 5: Solve for x
    x = 7,804,328,703.95/85,794.78
  6. Step 6: Final answer
    x = 90,965.08

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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.