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Finding the Fourth Proportional to 612,214.80, 916,507.80 and 455,139.60

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Solution

The fourth proportional to 612,214.80, 916,507.80 and 455,139.60 is: 681,360.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,214.80 : 916,507.80 = 455,139.60 : x
  2. Step 2: Convert to fraction form
    612,214.80/916,507.80 = 455,139.60/x
  3. Step 3: Cross multiply
    612,214.80x = 916,507.80 × 455,139.60
  4. Step 4: Simplify right side
    612,214.80x = 417,138,993,488.88
  5. Step 5: Solve for x
    x = 417,138,993,488.88/612,214.80
  6. Step 6: Final answer
    x = 681,360.52

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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.