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Finding the Fourth Proportional to 645,235.47, 890,422.88 and 358,755.48

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Solution

The fourth proportional to 645,235.47, 890,422.88 and 358,755.48 is: 495,081.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,235.47 : 890,422.88 = 358,755.48 : x
  2. Step 2: Convert to fraction form
    645,235.47/890,422.88 = 358,755.48/x
  3. Step 3: Cross multiply
    645,235.47x = 890,422.88 × 358,755.48
  4. Step 4: Simplify right side
    645,235.47x = 319,444,085,923.61
  5. Step 5: Solve for x
    x = 319,444,085,923.61/645,235.47
  6. Step 6: Final answer
    x = 495,081.41

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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.