Home / 687,451.28-948,796.80-400,971.36

Finding the Fourth Proportional to 687,451.28, 948,796.80 and 400,971.36

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Solution

The fourth proportional to 687,451.28, 948,796.80 and 400,971.36 is: 553,406.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,451.28 : 948,796.80 = 400,971.36 : x
  2. Step 2: Convert to fraction form
    687,451.28/948,796.80 = 400,971.36/x
  3. Step 3: Cross multiply
    687,451.28x = 948,796.80 × 400,971.36
  4. Step 4: Simplify right side
    687,451.28x = 380,440,343,259.65
  5. Step 5: Solve for x
    x = 380,440,343,259.65/687,451.28
  6. Step 6: Final answer
    x = 553,406.99

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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.