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Finding the Fourth Proportional to 709,409.44, 979,005.81 and 387,140.32

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Solution

The fourth proportional to 709,409.44, 979,005.81 and 387,140.32 is: 534,264.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,409.44 : 979,005.81 = 387,140.32 : x
  2. Step 2: Convert to fraction form
    709,409.44/979,005.81 = 387,140.32/x
  3. Step 3: Cross multiply
    709,409.44x = 979,005.81 × 387,140.32
  4. Step 4: Simplify right side
    709,409.44x = 379,012,622,565.26
  5. Step 5: Solve for x
    x = 379,012,622,565.26/709,409.44
  6. Step 6: Final answer
    x = 534,264.98

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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.