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Finding the Fourth Proportional to 875.10, 1,207.18 and 520.77

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Solution

The fourth proportional to 875.10, 1,207.18 and 520.77 is: 718.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.10 : 1,207.18 = 520.77 : x
  2. Step 2: Convert to fraction form
    875.10/1,207.18 = 520.77/x
  3. Step 3: Cross multiply
    875.10x = 1,207.18 × 520.77
  4. Step 4: Simplify right side
    875.10x = 628,667.64
  5. Step 5: Solve for x
    x = 628,667.64/875.10
  6. Step 6: Final answer
    x = 718.39

Related Problems

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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.