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Finding the Fourth Proportional to 85,985.80, 128,978.70 and 39,329.80

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Solution

The fourth proportional to 85,985.80, 128,978.70 and 39,329.80 is: 58,994.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,985.80 : 128,978.70 = 39,329.80 : x
  2. Step 2: Convert to fraction form
    85,985.80/128,978.70 = 39,329.80/x
  3. Step 3: Cross multiply
    85,985.80x = 128,978.70 × 39,329.80
  4. Step 4: Simplify right side
    85,985.80x = 5,072,706,475.26
  5. Step 5: Solve for x
    x = 5,072,706,475.26/85,985.80
  6. Step 6: Final answer
    x = 58,994.70

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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.