Home / 644,621.20-966,931.80-420,672.40

Finding the Fourth Proportional to 644,621.20, 966,931.80 and 420,672.40

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Solution

The fourth proportional to 644,621.20, 966,931.80 and 420,672.40 is: 631,008.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,621.20 : 966,931.80 = 420,672.40 : x
  2. Step 2: Convert to fraction form
    644,621.20/966,931.80 = 420,672.40/x
  3. Step 3: Cross multiply
    644,621.20x = 966,931.80 × 420,672.40
  4. Step 4: Simplify right side
    644,621.20x = 406,761,520,942.32
  5. Step 5: Solve for x
    x = 406,761,520,942.32/644,621.20
  6. Step 6: Final answer
    x = 631,008.60

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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.