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Finding the Fourth Proportional to 708,925.85, 978,149.46 and 402,978.21

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Solution

The fourth proportional to 708,925.85, 978,149.46 and 402,978.21 is: 556,014.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,925.85 : 978,149.46 = 402,978.21 : x
  2. Step 2: Convert to fraction form
    708,925.85/978,149.46 = 402,978.21/x
  3. Step 3: Cross multiply
    708,925.85x = 978,149.46 × 402,978.21
  4. Step 4: Simplify right side
    708,925.85x = 394,172,918,503.27
  5. Step 5: Solve for x
    x = 394,172,918,503.27/708,925.85
  6. Step 6: Final answer
    x = 556,014.32

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.