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Finding the Fourth Proportional to 385,855.70, 578,868.14 and 129,679.10

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Solution

The fourth proportional to 385,855.70, 578,868.14 and 129,679.10 is: 194,547.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,855.70 : 578,868.14 = 129,679.10 : x
  2. Step 2: Convert to fraction form
    385,855.70/578,868.14 = 129,679.10/x
  3. Step 3: Cross multiply
    385,855.70x = 578,868.14 × 129,679.10
  4. Step 4: Simplify right side
    385,855.70x = 75,067,095,871.14
  5. Step 5: Solve for x
    x = 75,067,095,871.14/385,855.70
  6. Step 6: Final answer
    x = 194,547.07

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1.5x scale

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.