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Finding the Fourth Proportional to 720,815.72, 994,685.52 and 398,507

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Solution

The fourth proportional to 720,815.72, 994,685.52 and 398,507 is: 549,917.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,815.72 : 994,685.52 = 398,507 : x
  2. Step 2: Convert to fraction form
    720,815.72/994,685.52 = 398,507/x
  3. Step 3: Cross multiply
    720,815.72x = 994,685.52 × 398,507
  4. Step 4: Simplify right side
    720,815.72x = 396,389,142,518.64
  5. Step 5: Solve for x
    x = 396,389,142,518.64/720,815.72
  6. Step 6: Final answer
    x = 549,917.45

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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.