Home / 20,720,011.40-31,080,017.10-12,657,854.60

Finding the Fourth Proportional to 20,720,011.40, 31,080,017.10 and 12,657,854.60

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Solution

The fourth proportional to 20,720,011.40, 31,080,017.10 and 12,657,854.60 is: 18,986,781.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720,011.40 : 31,080,017.10 = 12,657,854.60 : x
  2. Step 2: Convert to fraction form
    20,720,011.40/31,080,017.10 = 12,657,854.60/x
  3. Step 3: Cross multiply
    20,720,011.40x = 31,080,017.10 × 12,657,854.60
  4. Step 4: Simplify right side
    20,720,011.40x = 393,406,337,417,313.69
  5. Step 5: Solve for x
    x = 393,406,337,417,313.69/20,720,011.40
  6. Step 6: Final answer
    x = 18,986,781.90

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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.