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Finding the Fourth Proportional to 586,139.80, 879,209.70 and 212,114.20

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Solution

The fourth proportional to 586,139.80, 879,209.70 and 212,114.20 is: 318,171.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    586,139.80 : 879,209.70 = 212,114.20 : x
  2. Step 2: Convert to fraction form
    586,139.80/879,209.70 = 212,114.20/x
  3. Step 3: Cross multiply
    586,139.80x = 879,209.70 × 212,114.20
  4. Step 4: Simplify right side
    586,139.80x = 186,492,862,147.74
  5. Step 5: Solve for x
    x = 186,492,862,147.74/586,139.80
  6. Step 6: Final answer
    x = 318,171.30

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Similar ratio
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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.