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Finding the Fourth Proportional to 612,090.30, 918,135.45 and 280,314.30

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Solution

The fourth proportional to 612,090.30, 918,135.45 and 280,314.30 is: 420,471.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,090.30 : 918,135.45 = 280,314.30 : x
  2. Step 2: Convert to fraction form
    612,090.30/918,135.45 = 280,314.30/x
  3. Step 3: Cross multiply
    612,090.30x = 918,135.45 × 280,314.30
  4. Step 4: Simplify right side
    612,090.30x = 257,366,495,971.94
  5. Step 5: Solve for x
    x = 257,366,495,971.94/612,090.30
  6. Step 6: Final answer
    x = 420,471.45

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Double scale
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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.