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Finding the Fourth Proportional to 385,774.60, 578,661.90 and 105,320.20

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Solution

The fourth proportional to 385,774.60, 578,661.90 and 105,320.20 is: 157,980.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,774.60 : 578,661.90 = 105,320.20 : x
  2. Step 2: Convert to fraction form
    385,774.60/578,661.90 = 105,320.20/x
  3. Step 3: Cross multiply
    385,774.60x = 578,661.90 × 105,320.20
  4. Step 4: Simplify right side
    385,774.60x = 60,944,787,040.38
  5. Step 5: Solve for x
    x = 60,944,787,040.38/385,774.60
  6. Step 6: Final answer
    x = 157,980.30

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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.