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Finding the Fourth Proportional to 639,178, 959,133.32 and 260,028.74

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Solution

The fourth proportional to 639,178, 959,133.32 and 260,028.74 is: 390,192.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,178 : 959,133.32 = 260,028.74 : x
  2. Step 2: Convert to fraction form
    639,178/959,133.32 = 260,028.74/x
  3. Step 3: Cross multiply
    639,178x = 959,133.32 × 260,028.74
  4. Step 4: Simplify right side
    639,178x = 249,402,228,691.62
  5. Step 5: Solve for x
    x = 249,402,228,691.62/639,178
  6. Step 6: Final answer
    x = 390,192.14

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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.