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Finding the Fourth Proportional to 858,605.40, 1,287,908.10 and 485,357.40

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Solution

The fourth proportional to 858,605.40, 1,287,908.10 and 485,357.40 is: 728,036.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,605.40 : 1,287,908.10 = 485,357.40 : x
  2. Step 2: Convert to fraction form
    858,605.40/1,287,908.10 = 485,357.40/x
  3. Step 3: Cross multiply
    858,605.40x = 1,287,908.10 × 485,357.40
  4. Step 4: Simplify right side
    858,605.40x = 625,095,726,854.94
  5. Step 5: Solve for x
    x = 625,095,726,854.94/858,605.40
  6. Step 6: Final answer
    x = 728,036.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.