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Finding the Fourth Proportional to 661,510.40, 991,016.92 and 390,830.84

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Solution

The fourth proportional to 661,510.40, 991,016.92 and 390,830.84 is: 585,508.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,510.40 : 991,016.92 = 390,830.84 : x
  2. Step 2: Convert to fraction form
    661,510.40/991,016.92 = 390,830.84/x
  3. Step 3: Cross multiply
    661,510.40x = 991,016.92 × 390,830.84
  4. Step 4: Simplify right side
    661,510.40x = 387,319,975,297.81
  5. Step 5: Solve for x
    x = 387,319,975,297.81/661,510.40
  6. Step 6: Final answer
    x = 585,508.52

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.