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Finding the Fourth Proportional to 402,455.60, 602,992.20 and 191,639.60

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Solution

The fourth proportional to 402,455.60, 602,992.20 and 191,639.60 is: 287,130.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,455.60 : 602,992.20 = 191,639.60 : x
  2. Step 2: Convert to fraction form
    402,455.60/602,992.20 = 191,639.60/x
  3. Step 3: Cross multiply
    402,455.60x = 602,992.20 × 191,639.60
  4. Step 4: Simplify right side
    402,455.60x = 115,557,184,011.12
  5. Step 5: Solve for x
    x = 115,557,184,011.12/402,455.60
  6. Step 6: Final answer
    x = 287,130.27

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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.