Home / 1,985.03-2,740.60-1,387.32

Finding the Fourth Proportional to 1,985.03, 2,740.60 and 1,387.32

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Solution

The fourth proportional to 1,985.03, 2,740.60 and 1,387.32 is: 1,915.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.03 : 2,740.60 = 1,387.32 : x
  2. Step 2: Convert to fraction form
    1,985.03/2,740.60 = 1,387.32/x
  3. Step 3: Cross multiply
    1,985.03x = 2,740.60 × 1,387.32
  4. Step 4: Simplify right side
    1,985.03x = 3,802,089.19
  5. Step 5: Solve for x
    x = 3,802,089.19/1,985.03
  6. Step 6: Final answer
    x = 1,915.38

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Double scale
Find fourth proportional to 1,986.03, 2,741.98 and 1,388.32
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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.