Home / 645,778.08-891,216.34-359,298.76

Finding the Fourth Proportional to 645,778.08, 891,216.34 and 359,298.76

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Solution

The fourth proportional to 645,778.08, 891,216.34 and 359,298.76 is: 495,855.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,778.08 : 891,216.34 = 359,298.76 : x
  2. Step 2: Convert to fraction form
    645,778.08/891,216.34 = 359,298.76/x
  3. Step 3: Cross multiply
    645,778.08x = 891,216.34 × 359,298.76
  4. Step 4: Simplify right side
    645,778.08x = 320,212,925,853.74
  5. Step 5: Solve for x
    x = 320,212,925,853.74/645,778.08
  6. Step 6: Final answer
    x = 495,855.98

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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.