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Finding the Fourth Proportional to 715,700.40, 987,655.44 and 393,403.62

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Solution

The fourth proportional to 715,700.40, 987,655.44 and 393,403.62 is: 542,890.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,700.40 : 987,655.44 = 393,403.62 : x
  2. Step 2: Convert to fraction form
    715,700.40/987,655.44 = 393,403.62/x
  3. Step 3: Cross multiply
    715,700.40x = 987,655.44 × 393,403.62
  4. Step 4: Simplify right side
    715,700.40x = 388,547,225,408.69
  5. Step 5: Solve for x
    x = 388,547,225,408.69/715,700.40
  6. Step 6: Final answer
    x = 542,890.89

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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.