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Finding the Fourth Proportional to 245,440.80, 338,690.64 and 138,026.40

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Solution

The fourth proportional to 245,440.80, 338,690.64 and 138,026.40 is: 190,466.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,440.80 : 338,690.64 = 138,026.40 : x
  2. Step 2: Convert to fraction form
    245,440.80/338,690.64 = 138,026.40/x
  3. Step 3: Cross multiply
    245,440.80x = 338,690.64 × 138,026.40
  4. Step 4: Simplify right side
    245,440.80x = 46,748,249,752.90
  5. Step 5: Solve for x
    x = 46,748,249,752.90/245,440.80
  6. Step 6: Final answer
    x = 190,466.50

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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.