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Finding the Fourth Proportional to 713,138.42, 984,138.72 and 390,841.58

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Solution

The fourth proportional to 713,138.42, 984,138.72 and 390,841.58 is: 539,365.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,138.42 : 984,138.72 = 390,841.58 : x
  2. Step 2: Convert to fraction form
    713,138.42/984,138.72 = 390,841.58/x
  3. Step 3: Cross multiply
    713,138.42x = 984,138.72 × 390,841.58
  4. Step 4: Simplify right side
    713,138.42x = 384,642,332,263.98
  5. Step 5: Solve for x
    x = 384,642,332,263.98/713,138.42
  6. Step 6: Final answer
    x = 539,365.60

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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.