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Finding the Fourth Proportional to 485,988.28, 670,648.62 and 284,918.20

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Solution

The fourth proportional to 485,988.28, 670,648.62 and 284,918.20 is: 393,178.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,988.28 : 670,648.62 = 284,918.20 : x
  2. Step 2: Convert to fraction form
    485,988.28/670,648.62 = 284,918.20/x
  3. Step 3: Cross multiply
    485,988.28x = 670,648.62 × 284,918.20
  4. Step 4: Simplify right side
    485,988.28x = 191,079,997,642.88
  5. Step 5: Solve for x
    x = 191,079,997,642.88/485,988.28
  6. Step 6: Final answer
    x = 393,178.20

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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.