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Finding the Fourth Proportional to 866,390.40, 1,298,710.80 and 393,415.20

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Solution

The fourth proportional to 866,390.40, 1,298,710.80 and 393,415.20 is: 589,725.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    866,390.40 : 1,298,710.80 = 393,415.20 : x
  2. Step 2: Convert to fraction form
    866,390.40/1,298,710.80 = 393,415.20/x
  3. Step 3: Cross multiply
    866,390.40x = 1,298,710.80 × 393,415.20
  4. Step 4: Simplify right side
    866,390.40x = 510,932,569,124.16
  5. Step 5: Solve for x
    x = 510,932,569,124.16/866,390.40
  6. Step 6: Final answer
    x = 589,725.57

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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.