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Finding the Fourth Proportional to 830.41, 1,145.95 and 457.40

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Solution

The fourth proportional to 830.41, 1,145.95 and 457.40 is: 631.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.41 : 1,145.95 = 457.40 : x
  2. Step 2: Convert to fraction form
    830.41/1,145.95 = 457.40/x
  3. Step 3: Cross multiply
    830.41x = 1,145.95 × 457.40
  4. Step 4: Simplify right side
    830.41x = 524,150.66
  5. Step 5: Solve for x
    x = 524,150.66/830.41
  6. Step 6: Final answer
    x = 631.20

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.