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Finding the Fourth Proportional to 865,903.80, 1,298,885.40 and 266,860.20

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Solution

The fourth proportional to 865,903.80, 1,298,885.40 and 266,860.20 is: 400,299.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,903.80 : 1,298,885.40 = 266,860.20 : x
  2. Step 2: Convert to fraction form
    865,903.80/1,298,885.40 = 266,860.20/x
  3. Step 3: Cross multiply
    865,903.80x = 1,298,885.40 × 266,860.20
  4. Step 4: Simplify right side
    865,903.80x = 346,620,817,621.08
  5. Step 5: Solve for x
    x = 346,620,817,621.08/865,903.80
  6. Step 6: Final answer
    x = 400,299.45

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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.