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Finding the Fourth Proportional to 399,398.60, 550,513.86 and 283,151.72

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Solution

The fourth proportional to 399,398.60, 550,513.86 and 283,151.72 is: 390,284.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,398.60 : 550,513.86 = 283,151.72 : x
  2. Step 2: Convert to fraction form
    399,398.60/550,513.86 = 283,151.72/x
  3. Step 3: Cross multiply
    399,398.60x = 550,513.86 × 283,151.72
  4. Step 4: Simplify right side
    399,398.60x = 155,878,946,342.84
  5. Step 5: Solve for x
    x = 155,878,946,342.84/399,398.60
  6. Step 6: Final answer
    x = 390,284.16

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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.