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Finding the Fourth Proportional to 806.76, 1,113.20 and 457.40

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Solution

The fourth proportional to 806.76, 1,113.20 and 457.40 is: 631.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.76 : 1,113.20 = 457.40 : x
  2. Step 2: Convert to fraction form
    806.76/1,113.20 = 457.40/x
  3. Step 3: Cross multiply
    806.76x = 1,113.20 × 457.40
  4. Step 4: Simplify right side
    806.76x = 509,177.68
  5. Step 5: Solve for x
    x = 509,177.68/806.76
  6. Step 6: Final answer
    x = 631.14

Related Problems

Find fourth proportional to 403.38, 556.60 and 228.70
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.