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Finding the Fourth Proportional to 272,909.40, 409,364.10 and 85,920.90

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Solution

The fourth proportional to 272,909.40, 409,364.10 and 85,920.90 is: 128,881.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    272,909.40 : 409,364.10 = 85,920.90 : x
  2. Step 2: Convert to fraction form
    272,909.40/409,364.10 = 85,920.90/x
  3. Step 3: Cross multiply
    272,909.40x = 409,364.10 × 85,920.90
  4. Step 4: Simplify right side
    272,909.40x = 35,172,931,899.69
  5. Step 5: Solve for x
    x = 35,172,931,899.69/272,909.40
  6. Step 6: Final answer
    x = 128,881.35

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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.