Home / 687,792,342.69-949,168,865.75-390,406,571.01

Finding the Fourth Proportional to 687,792,342.69, 949,168,865.75 and 390,406,571.01

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Solution

The fourth proportional to 687,792,342.69, 949,168,865.75 and 390,406,571.01 is: 538,769,828.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,792,342.69 : 949,168,865.75 = 390,406,571.01 : x
  2. Step 2: Convert to fraction form
    687,792,342.69/949,168,865.75 = 390,406,571.01/x
  3. Step 3: Cross multiply
    687,792,342.69x = 949,168,865.75 × 390,406,571.01
  4. Step 4: Simplify right side
    687,792,342.69x = 370,561,762,184,956,480
  5. Step 5: Solve for x
    x = 370,561,762,184,956,480/687,792,342.69
  6. Step 6: Final answer
    x = 538,769,828.02

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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.