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Finding the Fourth Proportional to 403,128.80, 604,693.20 and 340,143.20

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Solution

The fourth proportional to 403,128.80, 604,693.20 and 340,143.20 is: 510,214.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,128.80 : 604,693.20 = 340,143.20 : x
  2. Step 2: Convert to fraction form
    403,128.80/604,693.20 = 340,143.20/x
  3. Step 3: Cross multiply
    403,128.80x = 604,693.20 × 340,143.20
  4. Step 4: Simplify right side
    403,128.80x = 205,682,280,066.24
  5. Step 5: Solve for x
    x = 205,682,280,066.24/403,128.80
  6. Step 6: Final answer
    x = 510,214.80

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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.