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Finding the Fourth Proportional to 139,715.80, 209,573.70 and 83,728.60

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Solution

The fourth proportional to 139,715.80, 209,573.70 and 83,728.60 is: 125,592.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,715.80 : 209,573.70 = 83,728.60 : x
  2. Step 2: Convert to fraction form
    139,715.80/209,573.70 = 83,728.60/x
  3. Step 3: Cross multiply
    139,715.80x = 209,573.70 × 83,728.60
  4. Step 4: Simplify right side
    139,715.80x = 17,547,312,497.82
  5. Step 5: Solve for x
    x = 17,547,312,497.82/139,715.80
  6. Step 6: Final answer
    x = 125,592.90

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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.