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Finding the Fourth Proportional to 645,574.69, 890,857.74 and 355,180.78

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Solution

The fourth proportional to 645,574.69, 890,857.74 and 355,180.78 is: 490,130.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,574.69 : 890,857.74 = 355,180.78 : x
  2. Step 2: Convert to fraction form
    645,574.69/890,857.74 = 355,180.78/x
  3. Step 3: Cross multiply
    645,574.69x = 890,857.74 × 355,180.78
  4. Step 4: Simplify right side
    645,574.69x = 316,415,546,962.24
  5. Step 5: Solve for x
    x = 316,415,546,962.24/645,574.69
  6. Step 6: Final answer
    x = 490,130.04

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1.5x scale

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.