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Finding the Fourth Proportional to 720,538.74, 994,307.70 and 398,240.55

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Solution

The fourth proportional to 720,538.74, 994,307.70 and 398,240.55 is: 549,552.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,538.74 : 994,307.70 = 398,240.55 : x
  2. Step 2: Convert to fraction form
    720,538.74/994,307.70 = 398,240.55/x
  3. Step 3: Cross multiply
    720,538.74x = 994,307.70 × 398,240.55
  4. Step 4: Simplify right side
    720,538.74x = 395,973,646,810.64
  5. Step 5: Solve for x
    x = 395,973,646,810.64/720,538.74
  6. Step 6: Final answer
    x = 549,552.20

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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.