Home / 3,128.40-4,316.88-1,802.16

Finding the Fourth Proportional to 3,128.40, 4,316.88 and 1,802.16

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Solution

The fourth proportional to 3,128.40, 4,316.88 and 1,802.16 is: 2,486.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,128.40 : 4,316.88 = 1,802.16 : x
  2. Step 2: Convert to fraction form
    3,128.40/4,316.88 = 1,802.16/x
  3. Step 3: Cross multiply
    3,128.40x = 4,316.88 × 1,802.16
  4. Step 4: Simplify right side
    3,128.40x = 7,779,708.46
  5. Step 5: Solve for x
    x = 7,779,708.46/3,128.40
  6. Step 6: Final answer
    x = 2,486.80

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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.