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Finding the Fourth Proportional to 645,479.76, 890,762.04 and 355,095.36

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Solution

The fourth proportional to 645,479.76, 890,762.04 and 355,095.36 is: 490,031.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,479.76 : 890,762.04 = 355,095.36 : x
  2. Step 2: Convert to fraction form
    645,479.76/890,762.04 = 355,095.36/x
  3. Step 3: Cross multiply
    645,479.76x = 890,762.04 × 355,095.36
  4. Step 4: Simplify right side
    645,479.76x = 316,305,467,268.13
  5. Step 5: Solve for x
    x = 316,305,467,268.13/645,479.76
  6. Step 6: Final answer
    x = 490,031.58

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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.