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Finding the Fourth Proportional to 635,312.40, 876,777.12 and 420,079.20

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Solution

The fourth proportional to 635,312.40, 876,777.12 and 420,079.20 is: 579,739.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    635,312.40 : 876,777.12 = 420,079.20 : x
  2. Step 2: Convert to fraction form
    635,312.40/876,777.12 = 420,079.20/x
  3. Step 3: Cross multiply
    635,312.40x = 876,777.12 × 420,079.20
  4. Step 4: Simplify right side
    635,312.40x = 368,315,831,147.90
  5. Step 5: Solve for x
    x = 368,315,831,147.90/635,312.40
  6. Step 6: Final answer
    x = 579,739.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.