Home / 1,809.47-2,495.40-1,389.84

Finding the Fourth Proportional to 1,809.47, 2,495.40 and 1,389.84

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Solution

The fourth proportional to 1,809.47, 2,495.40 and 1,389.84 is: 1,916.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,809.47 : 2,495.40 = 1,389.84 : x
  2. Step 2: Convert to fraction form
    1,809.47/2,495.40 = 1,389.84/x
  3. Step 3: Cross multiply
    1,809.47x = 2,495.40 × 1,389.84
  4. Step 4: Simplify right side
    1,809.47x = 3,468,206.74
  5. Step 5: Solve for x
    x = 3,468,206.74/1,809.47
  6. Step 6: Final answer
    x = 1,916.70

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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.