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Finding the Fourth Proportional to 320,412.60, 480,618.90 and 83,779.20

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Solution

The fourth proportional to 320,412.60, 480,618.90 and 83,779.20 is: 125,668.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,412.60 : 480,618.90 = 83,779.20 : x
  2. Step 2: Convert to fraction form
    320,412.60/480,618.90 = 83,779.20/x
  3. Step 3: Cross multiply
    320,412.60x = 480,618.90 × 83,779.20
  4. Step 4: Simplify right side
    320,412.60x = 40,265,866,946.88
  5. Step 5: Solve for x
    x = 40,265,866,946.88/320,412.60
  6. Step 6: Final answer
    x = 125,668.80

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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.