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Finding the Fourth Proportional to 515.03, 710.72 and 305.23

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Solution

The fourth proportional to 515.03, 710.72 and 305.23 is: 421.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.03 : 710.72 = 305.23 : x
  2. Step 2: Convert to fraction form
    515.03/710.72 = 305.23/x
  3. Step 3: Cross multiply
    515.03x = 710.72 × 305.23
  4. Step 4: Simplify right side
    515.03x = 216,931.38
  5. Step 5: Solve for x
    x = 216,931.38/515.03
  6. Step 6: Final answer
    x = 421.20

Related Problems

Find fourth proportional to 257.52, 355.36 and 152.61
Half scale
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Double scale
Find fourth proportional to 516.03, 712.10 and 306.23
Similar ratio
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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.