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Finding the Fourth Proportional to 386,717.10, 580,075.65 and 260,745.90

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Solution

The fourth proportional to 386,717.10, 580,075.65 and 260,745.90 is: 391,118.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,717.10 : 580,075.65 = 260,745.90 : x
  2. Step 2: Convert to fraction form
    386,717.10/580,075.65 = 260,745.90/x
  3. Step 3: Cross multiply
    386,717.10x = 580,075.65 × 260,745.90
  4. Step 4: Simplify right side
    386,717.10x = 151,252,347,427.34
  5. Step 5: Solve for x
    x = 151,252,347,427.34/386,717.10
  6. Step 6: Final answer
    x = 391,118.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.