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Finding the Fourth Proportional to 644,934.88, 890,082.30 and 390,426.40

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Solution

The fourth proportional to 644,934.88, 890,082.30 and 390,426.40 is: 538,832.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,934.88 : 890,082.30 = 390,426.40 : x
  2. Step 2: Convert to fraction form
    644,934.88/890,082.30 = 390,426.40/x
  3. Step 3: Cross multiply
    644,934.88x = 890,082.30 × 390,426.40
  4. Step 4: Simplify right side
    644,934.88x = 347,511,628,092.72
  5. Step 5: Solve for x
    x = 347,511,628,092.72/644,934.88
  6. Step 6: Final answer
    x = 538,832.12

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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.