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Finding the Fourth Proportional to 715,807.80, 987,816.78 and 409,888.80

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Solution

The fourth proportional to 715,807.80, 987,816.78 and 409,888.80 is: 565,647.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,807.80 : 987,816.78 = 409,888.80 : x
  2. Step 2: Convert to fraction form
    715,807.80/987,816.78 = 409,888.80/x
  3. Step 3: Cross multiply
    715,807.80x = 987,816.78 × 409,888.80
  4. Step 4: Simplify right side
    715,807.80x = 404,895,034,574.06
  5. Step 5: Solve for x
    x = 404,895,034,574.06/715,807.80
  6. Step 6: Final answer
    x = 565,647.70

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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.