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Finding the Fourth Proportional to 644,985.28, 889,935.15 and 390,331

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Solution

The fourth proportional to 644,985.28, 889,935.15 and 390,331 is: 538,569.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,985.28 : 889,935.15 = 390,331 : x
  2. Step 2: Convert to fraction form
    644,985.28/889,935.15 = 390,331/x
  3. Step 3: Cross multiply
    644,985.28x = 889,935.15 × 390,331
  4. Step 4: Simplify right side
    644,985.28x = 347,369,277,034.65
  5. Step 5: Solve for x
    x = 347,369,277,034.65/644,985.28
  6. Step 6: Final answer
    x = 538,569.31

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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.