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Finding the Fourth Proportional to 257,418.94, 386,122.81 and 70,430.44

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Solution

The fourth proportional to 257,418.94, 386,122.81 and 70,430.44 is: 105,644.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,418.94 : 386,122.81 = 70,430.44 : x
  2. Step 2: Convert to fraction form
    257,418.94/386,122.81 = 70,430.44/x
  3. Step 3: Cross multiply
    257,418.94x = 386,122.81 × 70,430.44
  4. Step 4: Simplify right side
    257,418.94x = 27,194,799,402.34
  5. Step 5: Solve for x
    x = 27,194,799,402.34/257,418.94
  6. Step 6: Final answer
    x = 105,644.13

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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.