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Finding the Fourth Proportional to 642,356.55, 886,417.13 and 355,859.55

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Solution

The fourth proportional to 642,356.55, 886,417.13 and 355,859.55 is: 491,066.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,356.55 : 886,417.13 = 355,859.55 : x
  2. Step 2: Convert to fraction form
    642,356.55/886,417.13 = 355,859.55/x
  3. Step 3: Cross multiply
    642,356.55x = 886,417.13 × 355,859.55
  4. Step 4: Simplify right side
    642,356.55x = 315,439,999,214.79
  5. Step 5: Solve for x
    x = 315,439,999,214.79/642,356.55
  6. Step 6: Final answer
    x = 491,066.84

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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.