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Finding the Fourth Proportional to 644,390.38, 889,258.78 and 357,937.12

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Solution

The fourth proportional to 644,390.38, 889,258.78 and 357,937.12 is: 493,953.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,390.38 : 889,258.78 = 357,937.12 : x
  2. Step 2: Convert to fraction form
    644,390.38/889,258.78 = 357,937.12/x
  3. Step 3: Cross multiply
    644,390.38x = 889,258.78 × 357,937.12
  4. Step 4: Simplify right side
    644,390.38x = 318,298,726,647.91
  5. Step 5: Solve for x
    x = 318,298,726,647.91/644,390.38
  6. Step 6: Final answer
    x = 493,953.26

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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.