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Finding the Fourth Proportional to 625,429,914.88, 862,734,694.08 and 390,071,966.08

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Solution

The fourth proportional to 625,429,914.88, 862,734,694.08 and 390,071,966.08 is: 538,075,666.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    625,429,914.88 : 862,734,694.08 = 390,071,966.08 : x
  2. Step 2: Convert to fraction form
    625,429,914.88/862,734,694.08 = 390,071,966.08/x
  3. Step 3: Cross multiply
    625,429,914.88x = 862,734,694.08 × 390,071,966.08
  4. Step 4: Simplify right side
    625,429,914.88x = 336,528,618,325,212,928
  5. Step 5: Solve for x
    x = 336,528,618,325,212,928/625,429,914.88
  6. Step 6: Final answer
    x = 538,075,666.54

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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.