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Finding the Fourth Proportional to 709,889.68, 979,647.21 and 387,599.77

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Solution

The fourth proportional to 709,889.68, 979,647.21 and 387,599.77 is: 534,887.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,889.68 : 979,647.21 = 387,599.77 : x
  2. Step 2: Convert to fraction form
    709,889.68/979,647.21 = 387,599.77/x
  3. Step 3: Cross multiply
    709,889.68x = 979,647.21 × 387,599.77
  4. Step 4: Simplify right side
    709,889.68x = 379,711,033,124.07
  5. Step 5: Solve for x
    x = 379,711,033,124.07/709,889.68
  6. Step 6: Final answer
    x = 534,887.38

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1.5x scale

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.