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Finding the Fourth Proportional to 85,715.80, 128,573.70 and 26,569.60

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Solution

The fourth proportional to 85,715.80, 128,573.70 and 26,569.60 is: 39,854.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,715.80 : 128,573.70 = 26,569.60 : x
  2. Step 2: Convert to fraction form
    85,715.80/128,573.70 = 26,569.60/x
  3. Step 3: Cross multiply
    85,715.80x = 128,573.70 × 26,569.60
  4. Step 4: Simplify right side
    85,715.80x = 3,416,151,779.52
  5. Step 5: Solve for x
    x = 3,416,151,779.52/85,715.80
  6. Step 6: Final answer
    x = 39,854.40

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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.