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Finding the Fourth Proportional to 1,384.40, 1,911.16 and 1,030

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Solution

The fourth proportional to 1,384.40, 1,911.16 and 1,030 is: 1,421.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,384.40 : 1,911.16 = 1,030 : x
  2. Step 2: Convert to fraction form
    1,384.40/1,911.16 = 1,030/x
  3. Step 3: Cross multiply
    1,384.40x = 1,911.16 × 1,030
  4. Step 4: Simplify right side
    1,384.40x = 1,968,494.80
  5. Step 5: Solve for x
    x = 1,968,494.80/1,384.40
  6. Step 6: Final answer
    x = 1,421.91

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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.