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Finding the Fourth Proportional to 409,030.80, 613,565.40 and 128,557.20

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Solution

The fourth proportional to 409,030.80, 613,565.40 and 128,557.20 is: 192,841.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    409,030.80 : 613,565.40 = 128,557.20 : x
  2. Step 2: Convert to fraction form
    409,030.80/613,565.40 = 128,557.20/x
  3. Step 3: Cross multiply
    409,030.80x = 613,565.40 × 128,557.20
  4. Step 4: Simplify right side
    409,030.80x = 78,878,249,840.88
  5. Step 5: Solve for x
    x = 78,878,249,840.88/409,030.80
  6. Step 6: Final answer
    x = 192,841.83

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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.