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Finding the Fourth Proportional to 642,312.48, 886,397.40 and 355,838.64

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Solution

The fourth proportional to 642,312.48, 886,397.40 and 355,838.64 is: 491,060.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,312.48 : 886,397.40 = 355,838.64 : x
  2. Step 2: Convert to fraction form
    642,312.48/886,397.40 = 355,838.64/x
  3. Step 3: Cross multiply
    642,312.48x = 886,397.40 × 355,838.64
  4. Step 4: Simplify right side
    642,312.48x = 315,414,445,315.54
  5. Step 5: Solve for x
    x = 315,414,445,315.54/642,312.48
  6. Step 6: Final answer
    x = 491,060.75

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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.