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Finding the Fourth Proportional to 907,779.80, 1,361,669.70 and 309,416.60

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Solution

The fourth proportional to 907,779.80, 1,361,669.70 and 309,416.60 is: 464,124.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    907,779.80 : 1,361,669.70 = 309,416.60 : x
  2. Step 2: Convert to fraction form
    907,779.80/1,361,669.70 = 309,416.60/x
  3. Step 3: Cross multiply
    907,779.80x = 1,361,669.70 × 309,416.60
  4. Step 4: Simplify right side
    907,779.80x = 421,323,208,897.02
  5. Step 5: Solve for x
    x = 421,323,208,897.02/907,779.80
  6. Step 6: Final answer
    x = 464,124.90

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Similar ratio
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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.