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Finding the Fourth Proportional to 708,852,151.94, 978,231,628.79 and 391,311,645.77

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Solution

The fourth proportional to 708,852,151.94, 978,231,628.79 and 391,311,645.77 is: 540,018,715.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,852,151.94 : 978,231,628.79 = 391,311,645.77 : x
  2. Step 2: Convert to fraction form
    708,852,151.94/978,231,628.79 = 391,311,645.77/x
  3. Step 3: Cross multiply
    708,852,151.94x = 978,231,628.79 × 391,311,645.77
  4. Step 4: Simplify right side
    708,852,151.94x = 382,793,428,608,039,040
  5. Step 5: Solve for x
    x = 382,793,428,608,039,040/708,852,151.94
  6. Step 6: Final answer
    x = 540,018,715.56

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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.