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Finding the Fourth Proportional to 771.39, 1,064.55 and 476.45

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Solution

The fourth proportional to 771.39, 1,064.55 and 476.45 is: 657.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.39 : 1,064.55 = 476.45 : x
  2. Step 2: Convert to fraction form
    771.39/1,064.55 = 476.45/x
  3. Step 3: Cross multiply
    771.39x = 1,064.55 × 476.45
  4. Step 4: Simplify right side
    771.39x = 507,199.52
  5. Step 5: Solve for x
    x = 507,199.52/771.39
  6. Step 6: Final answer
    x = 657.51

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Half scale
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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.