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Finding the Fourth Proportional to 643.95, 963.90 and 526.50

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Solution

The fourth proportional to 643.95, 963.90 and 526.50 is: 788.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.95 : 963.90 = 526.50 : x
  2. Step 2: Convert to fraction form
    643.95/963.90 = 526.50/x
  3. Step 3: Cross multiply
    643.95x = 963.90 × 526.50
  4. Step 4: Simplify right side
    643.95x = 507,493.35
  5. Step 5: Solve for x
    x = 507,493.35/643.95
  6. Step 6: Final answer
    x = 788.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.