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Finding the Fourth Proportional to 642,207.71, 886,275.81 and 355,727.76

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Solution

The fourth proportional to 642,207.71, 886,275.81 and 355,727.76 is: 490,920.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,207.71 : 886,275.81 = 355,727.76 : x
  2. Step 2: Convert to fraction form
    642,207.71/886,275.81 = 355,727.76/x
  3. Step 3: Cross multiply
    642,207.71x = 886,275.81 × 355,727.76
  4. Step 4: Simplify right side
    642,207.71x = 315,272,908,633.49
  5. Step 5: Solve for x
    x = 315,272,908,633.49/642,207.71
  6. Step 6: Final answer
    x = 490,920.47

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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.