Home / 645,158.71-890,221.34-369,473.69

Finding the Fourth Proportional to 645,158.71, 890,221.34 and 369,473.69

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Solution

The fourth proportional to 645,158.71, 890,221.34 and 369,473.69 is: 509,817.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,158.71 : 890,221.34 = 369,473.69 : x
  2. Step 2: Convert to fraction form
    645,158.71/890,221.34 = 369,473.69/x
  3. Step 3: Cross multiply
    645,158.71x = 890,221.34 × 369,473.69
  4. Step 4: Simplify right side
    645,158.71x = 328,913,363,406.55
  5. Step 5: Solve for x
    x = 328,913,363,406.55/645,158.71
  6. Step 6: Final answer
    x = 509,817.76

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Double scale
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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.