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Finding the Fourth Proportional to 645,988.75, 891,455.77 and 359,508.76

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Solution

The fourth proportional to 645,988.75, 891,455.77 and 359,508.76 is: 496,117.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,988.75 : 891,455.77 = 359,508.76 : x
  2. Step 2: Convert to fraction form
    645,988.75/891,455.77 = 359,508.76/x
  3. Step 3: Cross multiply
    645,988.75x = 891,455.77 × 359,508.76
  4. Step 4: Simplify right side
    645,988.75x = 320,486,156,670.00
  5. Step 5: Solve for x
    x = 320,486,156,670.00/645,988.75
  6. Step 6: Final answer
    x = 496,117.24

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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.