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Finding the Fourth Proportional to 988.90, 1,483.38 and 339.63

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Solution

The fourth proportional to 988.90, 1,483.38 and 339.63 is: 509.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.90 : 1,483.38 = 339.63 : x
  2. Step 2: Convert to fraction form
    988.90/1,483.38 = 339.63/x
  3. Step 3: Cross multiply
    988.90x = 1,483.38 × 339.63
  4. Step 4: Simplify right side
    988.90x = 503,792.93
  5. Step 5: Solve for x
    x = 503,792.93/988.90
  6. Step 6: Final answer
    x = 509.45

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Double scale
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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.