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Finding the Fourth Proportional to 85,807.52, 128,711.40 and 35,860.30

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Solution

The fourth proportional to 85,807.52, 128,711.40 and 35,860.30 is: 53,790.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,807.52 : 128,711.40 = 35,860.30 : x
  2. Step 2: Convert to fraction form
    85,807.52/128,711.40 = 35,860.30/x
  3. Step 3: Cross multiply
    85,807.52x = 128,711.40 × 35,860.30
  4. Step 4: Simplify right side
    85,807.52x = 4,615,629,417.42
  5. Step 5: Solve for x
    x = 4,615,629,417.42/85,807.52
  6. Step 6: Final answer
    x = 53,790.50

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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.