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Finding the Fourth Proportional to 641,585.76, 885,374.40 and 355,088.64

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Solution

The fourth proportional to 641,585.76, 885,374.40 and 355,088.64 is: 490,014.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,585.76 : 885,374.40 = 355,088.64 : x
  2. Step 2: Convert to fraction form
    641,585.76/885,374.40 = 355,088.64/x
  3. Step 3: Cross multiply
    641,585.76x = 885,374.40 × 355,088.64
  4. Step 4: Simplify right side
    641,585.76x = 314,386,391,586.82
  5. Step 5: Solve for x
    x = 314,386,391,586.82/641,585.76
  6. Step 6: Final answer
    x = 490,014.60

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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.