Home / 639,050.48-881,732.12-390,629.76

Finding the Fourth Proportional to 639,050.48, 881,732.12 and 390,629.76

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Solution

The fourth proportional to 639,050.48, 881,732.12 and 390,629.76 is: 538,972.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,050.48 : 881,732.12 = 390,629.76 : x
  2. Step 2: Convert to fraction form
    639,050.48/881,732.12 = 390,629.76/x
  3. Step 3: Cross multiply
    639,050.48x = 881,732.12 × 390,629.76
  4. Step 4: Simplify right side
    639,050.48x = 344,430,806,419.89
  5. Step 5: Solve for x
    x = 344,430,806,419.89/639,050.48
  6. Step 6: Final answer
    x = 538,972.77

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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.