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Finding the Fourth Proportional to 385,391.60, 578,087.40 and 207,807.20

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Solution

The fourth proportional to 385,391.60, 578,087.40 and 207,807.20 is: 311,710.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,391.60 : 578,087.40 = 207,807.20 : x
  2. Step 2: Convert to fraction form
    385,391.60/578,087.40 = 207,807.20/x
  3. Step 3: Cross multiply
    385,391.60x = 578,087.40 × 207,807.20
  4. Step 4: Simplify right side
    385,391.60x = 120,130,723,949.28
  5. Step 5: Solve for x
    x = 120,130,723,949.28/385,391.60
  6. Step 6: Final answer
    x = 311,710.80

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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.