Home / 638,004,721.68-880,009,458.84-390,608,307.36

Finding the Fourth Proportional to 638,004,721.68, 880,009,458.84 and 390,608,307.36

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Solution

The fourth proportional to 638,004,721.68, 880,009,458.84 and 390,608,307.36 is: 538,771,882.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,004,721.68 : 880,009,458.84 = 390,608,307.36 : x
  2. Step 2: Convert to fraction form
    638,004,721.68/880,009,458.84 = 390,608,307.36/x
  3. Step 3: Cross multiply
    638,004,721.68x = 880,009,458.84 × 390,608,307.36
  4. Step 4: Simplify right side
    638,004,721.68x = 343,739,005,178,281,984
  5. Step 5: Solve for x
    x = 343,739,005,178,281,984/638,004,721.68
  6. Step 6: Final answer
    x = 538,771,882.87

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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.