Home / 645,138.28-890,292.66-358,662.76

Finding the Fourth Proportional to 645,138.28, 890,292.66 and 358,662.76

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Solution

The fourth proportional to 645,138.28, 890,292.66 and 358,662.76 is: 494,955.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,138.28 : 890,292.66 = 358,662.76 : x
  2. Step 2: Convert to fraction form
    645,138.28/890,292.66 = 358,662.76/x
  3. Step 3: Cross multiply
    645,138.28x = 890,292.66 × 358,662.76
  4. Step 4: Simplify right side
    645,138.28x = 319,314,822,643.34
  5. Step 5: Solve for x
    x = 319,314,822,643.34/645,138.28
  6. Step 6: Final answer
    x = 494,955.63

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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.