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Finding the Fourth Proportional to 1,210.36, 1,670.36 and 915.12

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Solution

The fourth proportional to 1,210.36, 1,670.36 and 915.12 is: 1,262.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.36 : 1,670.36 = 915.12 : x
  2. Step 2: Convert to fraction form
    1,210.36/1,670.36 = 915.12/x
  3. Step 3: Cross multiply
    1,210.36x = 1,670.36 × 915.12
  4. Step 4: Simplify right side
    1,210.36x = 1,528,579.84
  5. Step 5: Solve for x
    x = 1,528,579.84/1,210.36
  6. Step 6: Final answer
    x = 1,262.91

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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.