Home / 1,390.40-1,919-1,058.32

Finding the Fourth Proportional to 1,390.40, 1,919 and 1,058.32

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Solution

The fourth proportional to 1,390.40, 1,919 and 1,058.32 is: 1,460.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.40 : 1,919 = 1,058.32 : x
  2. Step 2: Convert to fraction form
    1,390.40/1,919 = 1,058.32/x
  3. Step 3: Cross multiply
    1,390.40x = 1,919 × 1,058.32
  4. Step 4: Simplify right side
    1,390.40x = 2,030,916.08
  5. Step 5: Solve for x
    x = 2,030,916.08/1,390.40
  6. Step 6: Final answer
    x = 1,460.67

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Double scale
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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.