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Finding the Fourth Proportional to 715,842.23, 987,851.63 and 389,144.39

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Solution

The fourth proportional to 715,842.23, 987,851.63 and 389,144.39 is: 537,013.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,842.23 : 987,851.63 = 389,144.39 : x
  2. Step 2: Convert to fraction form
    715,842.23/987,851.63 = 389,144.39/x
  3. Step 3: Cross multiply
    715,842.23x = 987,851.63 × 389,144.39
  4. Step 4: Simplify right side
    715,842.23x = 384,416,916,000.46
  5. Step 5: Solve for x
    x = 384,416,916,000.46/715,842.23
  6. Step 6: Final answer
    x = 537,013.47

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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.