Home / 85,979.40-128,969.10-57,985.80

Finding the Fourth Proportional to 85,979.40, 128,969.10 and 57,985.80

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Solution

The fourth proportional to 85,979.40, 128,969.10 and 57,985.80 is: 86,978.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,979.40 : 128,969.10 = 57,985.80 : x
  2. Step 2: Convert to fraction form
    85,979.40/128,969.10 = 57,985.80/x
  3. Step 3: Cross multiply
    85,979.40x = 128,969.10 × 57,985.80
  4. Step 4: Simplify right side
    85,979.40x = 7,478,376,438.78
  5. Step 5: Solve for x
    x = 7,478,376,438.78/85,979.40
  6. Step 6: Final answer
    x = 86,978.70

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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.