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Finding the Fourth Proportional to 509.70, 764.55 and 317.70

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Solution

The fourth proportional to 509.70, 764.55 and 317.70 is: 476.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.70 : 764.55 = 317.70 : x
  2. Step 2: Convert to fraction form
    509.70/764.55 = 317.70/x
  3. Step 3: Cross multiply
    509.70x = 764.55 × 317.70
  4. Step 4: Simplify right side
    509.70x = 242,897.54
  5. Step 5: Solve for x
    x = 242,897.54/509.70
  6. Step 6: Final answer
    x = 476.55

Related Problems

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Half scale
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Double scale
Find fourth proportional to 510.70, 766.05 and 318.70
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.