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Finding the Fourth Proportional to 385,359.40, 578,039.10 and 148,709.80

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Solution

The fourth proportional to 385,359.40, 578,039.10 and 148,709.80 is: 223,064.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,359.40 : 578,039.10 = 148,709.80 : x
  2. Step 2: Convert to fraction form
    385,359.40/578,039.10 = 148,709.80/x
  3. Step 3: Cross multiply
    385,359.40x = 578,039.10 × 148,709.80
  4. Step 4: Simplify right side
    385,359.40x = 85,960,078,953.18
  5. Step 5: Solve for x
    x = 85,960,078,953.18/385,359.40
  6. Step 6: Final answer
    x = 223,064.70

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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.