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Finding the Fourth Proportional to 553,498.88, 763,828.45 and 311,781.45

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Solution

The fourth proportional to 553,498.88, 763,828.45 and 311,781.45 is: 430,258.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    553,498.88 : 763,828.45 = 311,781.45 : x
  2. Step 2: Convert to fraction form
    553,498.88/763,828.45 = 311,781.45/x
  3. Step 3: Cross multiply
    553,498.88x = 763,828.45 × 311,781.45
  4. Step 4: Simplify right side
    553,498.88x = 238,147,541,692.25
  5. Step 5: Solve for x
    x = 238,147,541,692.25/553,498.88
  6. Step 6: Final answer
    x = 430,258.40

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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.