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Finding the Fourth Proportional to 691,416, 954,154.08 and 389,620.80

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Solution

The fourth proportional to 691,416, 954,154.08 and 389,620.80 is: 537,676.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,416 : 954,154.08 = 389,620.80 : x
  2. Step 2: Convert to fraction form
    691,416/954,154.08 = 389,620.80/x
  3. Step 3: Cross multiply
    691,416x = 954,154.08 × 389,620.80
  4. Step 4: Simplify right side
    691,416x = 371,758,275,972.86
  5. Step 5: Solve for x
    x = 371,758,275,972.86/691,416
  6. Step 6: Final answer
    x = 537,676.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.