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Finding the Fourth Proportional to 691,924,985.97, 954,855,863.75 and 390,573,728.37

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Solution

The fourth proportional to 691,924,985.97, 954,855,863.75 and 390,573,728.37 is: 538,991,396.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,924,985.97 : 954,855,863.75 = 390,573,728.37 : x
  2. Step 2: Convert to fraction form
    691,924,985.97/954,855,863.75 = 390,573,728.37/x
  3. Step 3: Cross multiply
    691,924,985.97x = 954,855,863.75 × 390,573,728.37
  4. Step 4: Simplify right side
    691,924,985.97x = 372,941,614,759,077,952
  5. Step 5: Solve for x
    x = 372,941,614,759,077,952/691,924,985.97
  6. Step 6: Final answer
    x = 538,991,396.93

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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.