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Finding the Fourth Proportional to 207,515.90, 311,565.45 and 128,783.90

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Solution

The fourth proportional to 207,515.90, 311,565.45 and 128,783.90 is: 193,356.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,515.90 : 311,565.45 = 128,783.90 : x
  2. Step 2: Convert to fraction form
    207,515.90/311,565.45 = 128,783.90/x
  3. Step 3: Cross multiply
    207,515.90x = 311,565.45 × 128,783.90
  4. Step 4: Simplify right side
    207,515.90x = 40,124,613,756.26
  5. Step 5: Solve for x
    x = 40,124,613,756.26/207,515.90
  6. Step 6: Final answer
    x = 193,356.82

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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.