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Finding the Fourth Proportional to 1,038.90, 1,431.90 and 707.16

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Solution

The fourth proportional to 1,038.90, 1,431.90 and 707.16 is: 974.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.90 : 1,431.90 = 707.16 : x
  2. Step 2: Convert to fraction form
    1,038.90/1,431.90 = 707.16/x
  3. Step 3: Cross multiply
    1,038.90x = 1,431.90 × 707.16
  4. Step 4: Simplify right side
    1,038.90x = 1,012,582.40
  5. Step 5: Solve for x
    x = 1,012,582.40/1,038.90
  6. Step 6: Final answer
    x = 974.67

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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.