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Finding the Fourth Proportional to 867,779.80, 1,301,280.90 and 394,221.40

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Solution

The fourth proportional to 867,779.80, 1,301,280.90 and 394,221.40 is: 591,155.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    867,779.80 : 1,301,280.90 = 394,221.40 : x
  2. Step 2: Convert to fraction form
    867,779.80/1,301,280.90 = 394,221.40/x
  3. Step 3: Cross multiply
    867,779.80x = 1,301,280.90 × 394,221.40
  4. Step 4: Simplify right side
    867,779.80x = 512,992,778,191.26
  5. Step 5: Solve for x
    x = 512,992,778,191.26/867,779.80
  6. Step 6: Final answer
    x = 591,155.47

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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.