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Finding the Fourth Proportional to 687,451.05, 948,796.56 and 400,971.15

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Solution

The fourth proportional to 687,451.05, 948,796.56 and 400,971.15 is: 553,406.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,451.05 : 948,796.56 = 400,971.15 : x
  2. Step 2: Convert to fraction form
    687,451.05/948,796.56 = 400,971.15/x
  3. Step 3: Cross multiply
    687,451.05x = 948,796.56 × 400,971.15
  4. Step 4: Simplify right side
    687,451.05x = 380,440,047,779.24
  5. Step 5: Solve for x
    x = 380,440,047,779.24/687,451.05
  6. Step 6: Final answer
    x = 553,406.74

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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.