Home / 645,136.76-890,238.30-358,639.40

Finding the Fourth Proportional to 645,136.76, 890,238.30 and 358,639.40

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Solution

The fourth proportional to 645,136.76, 890,238.30 and 358,639.40 is: 494,894.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,136.76 : 890,238.30 = 358,639.40 : x
  2. Step 2: Convert to fraction form
    645,136.76/890,238.30 = 358,639.40/x
  3. Step 3: Cross multiply
    645,136.76x = 890,238.30 × 358,639.40
  4. Step 4: Simplify right side
    645,136.76x = 319,274,529,769.02
  5. Step 5: Solve for x
    x = 319,274,529,769.02/645,136.76
  6. Step 6: Final answer
    x = 494,894.34

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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.