Home / 678,739.40-1,018,109.10-342,816.20

Finding the Fourth Proportional to 678,739.40, 1,018,109.10 and 342,816.20

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Solution

The fourth proportional to 678,739.40, 1,018,109.10 and 342,816.20 is: 514,224.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,739.40 : 1,018,109.10 = 342,816.20 : x
  2. Step 2: Convert to fraction form
    678,739.40/1,018,109.10 = 342,816.20/x
  3. Step 3: Cross multiply
    678,739.40x = 1,018,109.10 × 342,816.20
  4. Step 4: Simplify right side
    678,739.40x = 349,024,292,847.42
  5. Step 5: Solve for x
    x = 349,024,292,847.42/678,739.40
  6. Step 6: Final answer
    x = 514,224.30

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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.