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Finding the Fourth Proportional to 1,290.16, 1,779.06 and 916.75

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Solution

The fourth proportional to 1,290.16, 1,779.06 and 916.75 is: 1,264.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.16 : 1,779.06 = 916.75 : x
  2. Step 2: Convert to fraction form
    1,290.16/1,779.06 = 916.75/x
  3. Step 3: Cross multiply
    1,290.16x = 1,779.06 × 916.75
  4. Step 4: Simplify right side
    1,290.16x = 1,630,953.26
  5. Step 5: Solve for x
    x = 1,630,953.26/1,290.16
  6. Step 6: Final answer
    x = 1,264.15

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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.