Home / 1,290,378-1,780,637.40-717,397.68

Finding the Fourth Proportional to 1,290,378, 1,780,637.40 and 717,397.68

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Solution

The fourth proportional to 1,290,378, 1,780,637.40 and 717,397.68 is: 989,961.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290,378 : 1,780,637.40 = 717,397.68 : x
  2. Step 2: Convert to fraction form
    1,290,378/1,780,637.40 = 717,397.68/x
  3. Step 3: Cross multiply
    1,290,378x = 1,780,637.40 × 717,397.68
  4. Step 4: Simplify right side
    1,290,378x = 1,277,425,139,681.23
  5. Step 5: Solve for x
    x = 1,277,425,139,681.23/1,290,378
  6. Step 6: Final answer
    x = 989,961.96

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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.