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Finding the Fourth Proportional to 709,412.93, 979,010.64 and 387,143.84

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Solution

The fourth proportional to 709,412.93, 979,010.64 and 387,143.84 is: 534,269.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,412.93 : 979,010.64 = 387,143.84 : x
  2. Step 2: Convert to fraction form
    709,412.93/979,010.64 = 387,143.84/x
  3. Step 3: Cross multiply
    709,412.93x = 979,010.64 × 387,143.84
  4. Step 4: Simplify right side
    709,412.93x = 379,017,933,675.40
  5. Step 5: Solve for x
    x = 379,017,933,675.40/709,412.93
  6. Step 6: Final answer
    x = 534,269.85

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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.