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Finding the Fourth Proportional to 986,989.80, 1,478,516.40 and 687,808.20

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Solution

The fourth proportional to 986,989.80, 1,478,516.40 and 687,808.20 is: 1,030,340.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    986,989.80 : 1,478,516.40 = 687,808.20 : x
  2. Step 2: Convert to fraction form
    986,989.80/1,478,516.40 = 687,808.20/x
  3. Step 3: Cross multiply
    986,989.80x = 1,478,516.40 × 687,808.20
  4. Step 4: Simplify right side
    986,989.80x = 1,016,935,703,754.48
  5. Step 5: Solve for x
    x = 1,016,935,703,754.48/986,989.80
  6. Step 6: Final answer
    x = 1,030,340.64

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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.