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Finding the Fourth Proportional to 708,939.12, 978,420.05 and 403,061.66

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Solution

The fourth proportional to 708,939.12, 978,420.05 and 403,061.66 is: 556,272.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,939.12 : 978,420.05 = 403,061.66 : x
  2. Step 2: Convert to fraction form
    708,939.12/978,420.05 = 403,061.66/x
  3. Step 3: Cross multiply
    708,939.12x = 978,420.05 × 403,061.66
  4. Step 4: Simplify right side
    708,939.12x = 394,363,602,622.88
  5. Step 5: Solve for x
    x = 394,363,602,622.88/708,939.12
  6. Step 6: Final answer
    x = 556,272.88

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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.