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Finding the Fourth Proportional to 830.76, 1,147.08 and 569.40

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Solution

The fourth proportional to 830.76, 1,147.08 and 569.40 is: 786.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.76 : 1,147.08 = 569.40 : x
  2. Step 2: Convert to fraction form
    830.76/1,147.08 = 569.40/x
  3. Step 3: Cross multiply
    830.76x = 1,147.08 × 569.40
  4. Step 4: Simplify right side
    830.76x = 653,147.35
  5. Step 5: Solve for x
    x = 653,147.35/830.76
  6. Step 6: Final answer
    x = 786.20

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.