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Finding the Fourth Proportional to 970, 1,455 and 286

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Solution

The fourth proportional to 970, 1,455 and 286 is: 429

Step by Step Solution

  1. Step 1: Write the proportion equation
    970 : 1,455 = 286 : x
  2. Step 2: Convert to fraction form
    970/1,455 = 286/x
  3. Step 3: Cross multiply
    970x = 1,455 × 286
  4. Step 4: Simplify right side
    970x = 416,130
  5. Step 5: Solve for x
    x = 416,130/970
  6. Step 6: Final answer
    x = 429

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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.