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Finding the Fourth Proportional to 1,915.15, 2,870.41 and 990.21

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Solution

The fourth proportional to 1,915.15, 2,870.41 and 990.21 is: 1,484.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,915.15 : 2,870.41 = 990.21 : x
  2. Step 2: Convert to fraction form
    1,915.15/2,870.41 = 990.21/x
  3. Step 3: Cross multiply
    1,915.15x = 2,870.41 × 990.21
  4. Step 4: Simplify right side
    1,915.15x = 2,842,303.74
  5. Step 5: Solve for x
    x = 2,842,303.74/1,915.15
  6. Step 6: Final answer
    x = 1,484.12

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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.