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Finding the Fourth Proportional to 645,138.76, 890,241.06 and 358,641.40

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Solution

The fourth proportional to 645,138.76, 890,241.06 and 358,641.40 is: 494,897.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,138.76 : 890,241.06 = 358,641.40 : x
  2. Step 2: Convert to fraction form
    645,138.76/890,241.06 = 358,641.40/x
  3. Step 3: Cross multiply
    645,138.76x = 890,241.06 × 358,641.40
  4. Step 4: Simplify right side
    645,138.76x = 319,277,300,095.88
  5. Step 5: Solve for x
    x = 319,277,300,095.88/645,138.76
  6. Step 6: Final answer
    x = 494,897.10

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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.